A.You are not alone, there are many of us who are shy, reserved and struggle to hold a conversation face to face and in a group.
There is nothing wrong, it's the way people are. We just need to find ways to overcome it. I'm glad that you have posted this, seeking to advise is the first positive step when 'you feel negative.'
You cannot do this overnight, first try to speak well, meaningfully and learn how to start a conversation, develop and hold a conservation alive or a debate life.
B. Please watch the news channels who debate on a particular topic. At times what they speak makes little sense, but see how they confidently hold themselves, argue, raise counterpoints etc. Watch the breaking news, there would very little substance but the person will have a brave face and speak non-stop making up words and sentences.
Watch good interviews of ministers, experts etc. Many local channels have 'in the hot seat' live interviews wherein difficult questions are asked point-blank to an authority/comissioner etc. Here focus on the body langauge, speech delivery etc of the person asking the question and the person answering it.
C. Share your problems with your cousin, close friend, sister or brother at home who can be the other person in your discussions on current issues, the politics, education etc. Here this family member or close friend is vital to help to have to confidence to develop a positive attitude, body language and to look at the person while speaking without being shy.
D. Then make new friends, interact with smaller groups in the college (at the library, campus, cafeteria, drama or debate groups etc). The wider you participate in events related to academic and student life, the better you get to shed your inhibitions and shyness. Learn to speak to the college administrative staff, the accountants, the lab assistants, the records supervisor, the coaches etc. This is help to build your courage to speak to the teaching faculty, dean etc.
E. Next, try to hold a meaningful conversation with friends or fellow collegemates of the opposite sex. There are many youngsters who find it difficult to talk to a boy or girl initially and often found at loss for words. This is just lack of expsoure during early years, you can overcome this easily.
F.Read simple books on self confidence.
The Magic of Thinking Big by David J. Schwartz
The Quick and Easy Way to Effective Speaking by Dale Carnegie
Think & Grow Rich by Napoleon Hill
The Leader In You by Dale Carnegie (this is good for any fresher graduate who has to face the new complex world and its difficulties)
Awaken the Giant Within by Tony Robbins
How to Develop Self-Confidence And Influence People by Dale Carnegie
Daring Greatly by Brené Brown
G. In short, you can do it over a period of time, if you are proactive, set apart few hours every day for this real-life practice. You will get better with a combination of listening, analyzing, speaking consciously always with the aim to improve and be better.